Abstract
Silica gel has been fluorinated with KF, Na2SiF6, NH4F and (NH4)2SiF6, and the resulting reagents have been analysed by 19F and 29Si magic angle spinning NMR and infrared spectroscopy. Fluorination with NH4F and (NH4)2SiF6 results in the formation of (SiO)3SiF groups at the surface, where F has replaced OH, whereas the anion SiF2−6 is formed when silica is fluorinated with KF.
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